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Indesign 2.x has been doing this at least under certain circumstances:
JPEG and - interestingly - LZW (and not ZIP) on top of that. I believe it
is a slip. Will have to check if that's improved in Indesign CS.

Olaf Druemmer

[EMAIL PROTECTED] wrote Thu, 4 Dec 2003 09:46:49 +0000

>I have now seen several examples of PDF files (made, I think,
>by InDesign or by Mac OS X but I can't confirm), which have 
>streams compressed first with DCTDecode (JPEG) then with 
>FlateDecode (ZIP).  
>
>Although this is clearly legal in PDF terms, it also seems 
>pointless or counterproductive.  Fortunately it doesn't seem
>to upset any of my code, but having compression reported
>as ZIP, JPEG does startle both me and our users!  
>
>Does anyone have any ideas or background on why we are seeing
>this bizarre compression strategy?
>
>Aandi Inston
>Quite Software



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